/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.aliyun.odps.mapred.bridge;

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;

/**
 * JVM state infos
 */
class StateInfo {

  public static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();

  public static long maxmem = 0;

  public static synchronized void updateMemStat(String msg) {
    long mem = memoryMXBean.getHeapMemoryUsage().getUsed();
    if (mem > maxmem) {
      maxmem = mem;
    }
    if (msg != null) {
      System.err.println("[JVM Heap Memory] used: " + mem + ", " + msg);
    }
  }

  public static synchronized void updateMemStat() {
    updateMemStat(null);
  }

  public static void init() {
    System.err.println("[JVM Heap Memory] maximum = " + memoryMXBean.getHeapMemoryUsage().getMax());
    updateMemStat("init stat info");
  }

  public static void printMaxMemo() {
    System.err.println("[JVM Heap Memory] max used = " + maxmem);
  }
}
